PowerTap Joule GPS User Guide - Manual (Page 22)

Joule GPS User Guide page 22
CHAPTER 4: SENSORS
CALIBRATION, PowerBeam
Once you are paired with the PowerBeam Resistance Unit (RU) there are two options available to calibrate the device: Rolldown
calibration or Manual calibration. There is also an option to reset the most recent calibration back to the factory default values.
RU Sensor
Activate Sensor
Start Pairing
Name
RU1
Sensor ID
130
Delete Sensor
Calibrate
Back to Bike
9:34
A
On or Off. Typically, always On. The Auto Zero
function follows the same steps outlined for
Manual Zero but does it continually during the
ride, whenever the bike is coasting for 4 or
more seconds. If your bike is a fixed-geared
or track bicycle you may consider turning
Auto Zero off.
Calibrating or “zeroing the torque” refers to the
process of resetting the Torque Offset value of
the physical torque tube (where the internal
strain guages actually measure wheel torque).
1) Make sure the power meter is awake and
communicating with the Joule GPS. Make sure
the bike is still, with absolutely no pressure
on the pedals or tension in the chain.
2) Select Manual Zero on Power Sensor screen.
The Calbration screen will appear. Torque
RAW should be 0. The last saved Torque
Offset is displayed. The value is typically
500-524 in-lbs.
3) Select Manual Zero on Calibration Screen.
The Torque Offset value will update with the
torque tube calibration value, given the
current environmental conditions.
RU Calibration
Roll Down
Manual
Reset to Default
Back to RU Sensor
9:34
A
RU Roll Down
Back to RU Calibration
Pedal to
18-20 mph
9:34
A
mph
0.0 2:00
REMAIN
RU Manual
Back to RU Calibration
Use +/- to match
RU Watts to Power
9:34
A
RU WATTS
210 230
POWER
- +
Roll Down
Manual
Reset
The RU Roll Down calibration screen will flash the “Pedal to...” message until the wheel speed is in the specified range.
Once in range, the clock will begin to count down. Continue pedaling, keeping the speed in range for the entire
countdown. This will allow the tire temperature and pressure to stabilize. Once the timer reaches zero, stop pedaling
and allow the wheel to spin down.
Select Manual calibration when another power meter is present on the bike and paired to the Joule GPS.
Begin pedaling to see power values from both the RU and the power meter. Once the RU has been clamped against the
tire, it is advisable to spend about 2 minutes pedaling to warm up the tire to stabilize the pressures . The vertical bar on
the graphic will show the current calibration within the acceptable range. Use the [PLUS] and [MINUS] buttons to
increase/decrease the value until the RU Watts and Power Watts are matching. While calibrating, pedal at a consistent
power and be sure to give the RU time to adjust with each increase/decrease.
Reset to Default will reset all values to the factory default calibration.
OPTION DESCRIPTION